How Crowded Is Effigy Mounds in October?
October is a busy month at Effigy Mounds National Monument, running about 1.5× the park's average month — roughly 13% of the year's visitors come in October. That puts it between the July peak and the December low. Overall our best-time score rates October as "Poor" for a visit. Typical October weather averages a high near 62°F and a low around 40°F, with about 2.7" of precipitation. You'll get about 10.8 hours of daylight to explore.
Frequently Asked Questions
October is busy at Effigy Mounds National Monument (about 1.5× the average month). Our best-time score rates it "Poor". The single best month overall is May.
The busiest month is July and the quietest is December. October sits at about 1.5× the park's average, or 13% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.